<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Vue_v-for</title>
</head>
<body>
    <div id="app">
        <input type="button" value="添加数据" @click="add">
        <input type="button" value="移除数据" @click="remove">
        <ul>
            <li v-for="(item,index) in arr" :title="item">
              序号：  {{ index }}    {{ item }}
            </li>
            <li v-for="(item,index) in objArr">
                {{ item.name }}
            </li>
        </ul>
        <h2 v-for="item in vegetables" v-bind:title="item.name">
            {{ item.name }}
        </h2>
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:"#app", 
            data:{
               arr:["北京","上海","广州","深圳"],
               objArr:[
                   { name:"jack" },
                   { name:"rose" }
               ],
                vegetables:[
                    {name:"西兰花炒蛋"},
                    {name:"蛋炒西兰花"}
                ]
            },
            methods:{
                add:function(){
                    this.vegetables.push({name:"花菜炒蛋"})
                },
                remove:function(){
                    this.vegetables.shift();  //shift() 方法用于把数组的第一个元素从其中删除，并返回第一个元素的值。
                }
            }
        })
    </script>
</body>
</html>
